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October 2019 CO2 Trap Results

The following table and graph show the average number of mosquitoes collected per CO2 trap per night during the month of October compared to the five-year average for the six most common mosquito species in San Mateo County. Culex pipiens, the northern house mosquito, was the most abundant mosquito collected this month and was collected in above average numbers. This species breeds in catch basins, water under buildings, and residential containers in yards. Trap collections of Culex erythrothorax have declined since September, reflecting the expected seasonality of this species. Other mosquito species are also being collected at fewer than five per trap.

 

Species

October 2019

5-year October average

Cx. pipiens

13.69

7.75

Cx. erythrothorax

3.10

1.80

Cx. tarsalis

0.13

0.16

Cs. incidens

0.33

0.53

Ae. sierrensis

0.01

0.004

Ae. washinoi

0.01

0.01

     

Commands